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          RecyclerView分析
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        <h2 id="RecyclerView"><a href="#RecyclerView" class="headerlink" title="RecyclerView"></a>RecyclerView</h2><blockquote>
<p>A flexible view for providing a limited window into a large data set.<br>一个灵活的view, 用于在有限的窗口空间中展示大量的数据集。</p>
</blockquote>
<p>RecyclerView 用来设计于在有限的窗口空间加载大量的数据，屏幕本身就是有限的窗口，从这个角度看，Android的应用开发，绝大部分场景都可以使用RecyclerView来搞定。<br>RcyclverView 是后续添加进来的控件，是官方团队给出的基于View体系自定义控件优秀案例, 不仅仅是RecyclerView, 以前的TextView, EditView, ImageView, 各种Layout,都是自定义控件的优秀案例，倒是我自己有些后知后觉了。<br>意味着搞定RecyclverView的实现原理, 基本上就算是搞定了自定义View</p>
<p>术语</p>
<pre><code>Adapter, 用来将数据集中的每个item数据展示到view中
Position, 用来标识数据集中的位置
Index, 用来标识Adapter中已使用的子view的位置索引。
Binding, 绑定数据集与子view
Recycle, 回收(复用)子view, 可以大大提高性能，主要是减少 layout inflate 或 constructor初使化的次数。layout inflate比较耗时
Scrap, 在布局过程中处于临时 detached 状态的
Dirty, 标识子view的状态, 在显示此view之前，必须要重新rebound</code></pre><p>ReyclerView中的位置</p>
<blockquote>
<p>RecyclerView introduces an additional level of abstraction between RecyclerView.Adapter and RecyclerView.LayoutManager to be able to detect data set changes in batches during a layout calculation.<br>RecyclerView在RecyclerView.Adapter 和 RecyclerView.LayoutManager之间引入了另一种抽象级别, 以便能够在布局计算期间可以批量地检测数据集的变化。<br>这里也是性能点，可以避免LayoutManager从Adapter跟踪变化来计算动画的时间, 同时，view binding的时机放在同一时间，可以避免不必要的binding。<br>基于这个原因，在RcyclerView中提供了两个方法分别获取两种类型的position.</p>
</blockquote>
<ul>
<li>layout position, 在最新一次的layout计算的子view的position, 这是LayoutManager视角的position, 相当于已使用(用户可见的)子view位置的索引。</li>
<li>adapter position, 在 adapter 中的position, 从adapter视角。与数据源中的index相对应, 用来处理点击事件拿到点击view的数据。</li>
</ul>
<p>注意:<br>    RecyclerView.ViewHolder.getAbsoluteAdapterPosition()<br>                            getBindingAdapterPosition()<br>    findViewHolderFroAdapterPosition()<br>    这些方法可能会拿不到位置，因为会出现RecyclerView.Adapter.notifyDataSetChanged调用后，LayoutManager还没有计算完的情况，所以要处理返回NO_POSITION或null 的情况。</p>
<p>DiffUtil<br>    可以计算出哪里不同，继而局部更新<br>    Eugene Myers 差分算法，动态规划</p>
<p>List mutation with SortedList<br>    使用SotedList来处理增量更新。可以定义如何排序子view, 这个时候可以自动触发RecyclerView可以使用的更新信号.<br>    如果仅需要处理插入或删除事件可以使用SortedList, 好处是只需要在内存中具有list的单个副本即可。<br>    SortedList.replaceAll(Object[]), 会计算不同, 但是此方法比上面的DiffUitl的差分算法有更多限制。</p>
<p>Paging library<br>    Paging library 扩展了Myer’s 的差分算法用来支持分页加载(paging loading).<br>    提供了PagedList类， 可以像自动加载列表(self-loading list)的操作。提供了像database或网络分页加载的API支持, 以及开箱即用的方便的列表差异(list diffing)支持，类似于ListAdapter和AsyncListDiffer<br>    Paging库是属于Jetpack组件库的一员。</p>
<h2 id="架构与实现"><a href="#架构与实现" class="headerlink" title="架构与实现"></a>架构与实现</h2><p>如何算是学会了RecyclerView呢？</p>
<ol>
<li><p>初步使用<br> 使用LinearLayoutManager, GridLayoutManager, StaggerGridLayoutManager实现常见的布局。</p>
</li>
<li><p>view绘制方法的生命周期<br><img src="/images/custom_view_lifecycle.png" alt=""></p>
<p> ViewGroup 的attachedToWindows()是何调调用的。这属于分支细节，现都假定是底层调用的。<br> 在RecyclerView中<br> requestLayout 的实现 </p>
<pre><code>通过mInterceptDepth 判断是否是当前view发起的。mLayoutSuppressed, 禁止layout和scroll的调用，综合决定是否可以requestLayout
通过后调用 View.requestLayout(), 里面会调用 mParent.requestLayout(), 实现在ViewGroup的子类中
如在ScrollView中会标记mIsLayoutDirty为true, 在RecyclerView中会标记mLayoutWasDefered=true, 重新绘制放在Adapter和LayoutManager中实现。
requestLayout()只是标记状态, 真正layout的时机是在刷新的时候。</code></pre><p> 如何触发刷新呢？ </p>
<pre><code>invalidate()
    如果view可见，刷新整个view, 在未来的某个时机, 回调onDraw
    invalidate 标记dirty Rect，刷新是底层UI循环周期性的回调
底层UI循环周期性的刷新回调, 对于自定义控件来说属于分支细节，暂假定是系统提供的UI循环。
这里没有跟踪到底层代码，有一个疑问，如果有UI循环，像游戏循环一样，那么是如何保证电量消耗的，跟据dirty状态，不绘制就能节约电量吗？
UI线程一直在循环中，同样是竞争CPU时间片, 触发UI线程的绘制可以是触摸，按键事件中断。
暂时这样假定，后续再验证。</code></pre><p> RecyclerView 中的onDraw 只是用来画ItemDecoration</p>
<p> ViewGroup 是不是也是将所有的view在onDraw的时候统一画？</p>
<pre><code>在onDispatchDraw 中调用了drawChild()
所以每一个view在measure的时候会记录自己的坐标，最后是画在同一个canvas
RecyclerView也是同理</code></pre><p> Drawable 和 Bitmap 有什么区别?</p>
<pre><code>Drawable是对“可以画的对象”的抽象
Bitmap 是一个简单的Drawable.</code></pre></li>
<li><p>RecyclerView, LayoutManger, Adapter, ViewHolder之间的关系及作用。<br> setLayoutManager, setAdapter是触发点, 具体是在何时使用的？</p>
<p> RecyclerView 的初始化逻辑是从构造函数开始. </p>
</li>
<li><p>LayoutManger 抽象出来是如何layout的</p>
</li>
<li><p>为什么要抽象出来Adapter, ViewHolder<br> 结合现实视角</p>
</li>
<li><p>动画的实现</p>
</li>
<li><p>滑动手势的实现</p>
</li>
<li><p>RecyclerView从初始化到与界面交互的流程，各角色的参与时机。</p>
</li>
<li><p>缓存以及回收机制的实现</p>
</li>
<li><p>性能瓶颈<br> 单个View的大小<br> 自定义控件直接继承View与组合SDK提供的控件相比，就性能而言，是否有提升，又提升多少呢?</p>
</li>
<li><p>自定义View的套路</p>
</li>
<li><p>View体系系统<br>View是如何绘制到OpenGL中的<br>View与直接使用OpenGL，性能差别在哪里<br>View体系统的演进<br>View, ViewGroup, Window, Surface, Layer</p>
</li>
</ol>
<p>UI的展示, 不外乎处理测量布局，滑动手势的处理, RecyclerView的效率在于回收机制，灵活可扩展性。基于这几个方面来学习RecyclerView的实现。</p>
<p>根据RecyclerView的使用画出时序图。</p>
<ol>
<li>测量布局</li>
<li>滑动手势</li>
<li>回收复用</li>
<li>灵活扩展</li>
</ol>
<p>RecyclerView, ViewHolder, RecyclerView.Adapter, LayoutManager, ItemTouchHelper, SelectionTracker, </p>
<h2 id="流程图"><a href="#流程图" class="headerlink" title="流程图"></a>流程图</h2><h2 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h2><ol>
<li><a href="https://blog.csdn.net/qq_23012315/article/details/50807224" target="_blank" rel="noopener">RecyclerView剖析</a></li>
<li><a href="https://mp.weixin.qq.com/s?__biz=MzA3NTYzODYzMg==&mid=2653578065&idx=2&sn=25e64a8bb7b5934cf0ce2e49549a80d6&chksm=84b3b156b3c43840061c28869671da915a25cf3be54891f040a3532e1bb17f9d32e244b79e3f&scene=0&key=&ascene=7&uin=&devicetype=android-23&version=26031b31&nettype=WIFI" target="_blank" rel="noopener">RecyclerView与ListView对比</a></li>
</ol>

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